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Groups > comp.soft-sys.math.mathematica > #1737
| From | Bill Rowe <readnews@sbcglobal.net> |
|---|---|
| Newsgroups | comp.soft-sys.math.mathematica |
| Subject | Re: SortBy |
| Date | 2011-04-16 11:36 +0000 |
| Organization | Steven M. Christensen and Associates, Inc and MathTensor, Inc. |
| Message-ID | <iobv0f$bfe$1@smc.vnet.net> (permalink) |
On 4/15/11 at 3:56 AM, graser@gmail.com (graser) wrote:
>I have a simple question for you.
>Let's say there is a list like
>KS = {{300, 48, 2}, {500, 23, 5}, {120, 55, 7}, {40, 32, 1}};
>I want to sort it by second element.
>I can use
>Sort[KS, #2[[2]] > #1[[2]] &]
>It gives out like
>{{500, 23, 5}, {40, 32, 1}, {300, 48, 2}, {120, 55, 7}}
>But if I want to use SortBy, how to do that?
>SortBy[KS, ??]
In[2]:= SortBy[ks, #[[2]] &]
Out[2]= {{500, 23, 5}, {40, 32, 1}, {300, 48, 2}, {120, 55, 7}}
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Re: SortBy Bill Rowe <readnews@sbcglobal.net> - 2011-04-16 11:36 +0000
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